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I am watching an OR/AS Let's Play where the player is trying to catch Primal Kyogre without using his Master Ball (since he was saving it for Deoxys) and his attempts often fail and result in his entire team getting OHKO'd, because he was still underleveled compared to Kyogre. I know that when I did that battle, my levels were much higher and that saved me from OHKO's.
And wow I got ninja'd twice... that's why I had two deleted posts, because I am very slow at the moment.